- What 6x - 4 + 7x = 17 - Algebra practice problem?

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How to test Petrol in blood? I'm trying to find a compound that contains an alkaline earth metal and a polytomic ion and then finding its molar mass.? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)? Naphthalene sublimation rate=3*10^-5/min. Volume of room=60m^3. How would I calculate the naphthalene concentration in the air of the room? How long do the batteries in Beats executives last?